Liftsng-jack



3 Sheets-Sheet l.

(No Model.)

' L. H. DAVIS.

LIFTING JACK.

Patented June 1s. 1882...

N. PETERS. Phuw-Lichograpner. washington. D. C.

(No Model.) Y 3 sheets-sheet 2.-

'L. H. DAVIS LIPTING JACK] No. 259,506. Patented J 1111e13,-1882.

ff/275i@ @www mmf m (No Modem 3 sheetsheet s,

L@ H. DAVIS.

LIFTING JACK.

Unitarian Sra'rne Parent @erica LEVIS II. DAVIS, OF WEST CHESTER, PENNSYLVANIA.

LEFTENG=JACK.

SPECIFICATION forming part of Letters Patent No. 259,506, dated .Tune 13, 1882.

Application fuga may 19, ieee. (No moda.)

To all whom it may concern:

De it known that I, LEVIS H. DAVIS, a citizen of the United States, residing at West Chester, in the county of Chester and State of Pennsylvania, haveinvented new' and useful Improvements in Lifting-Jacks, of which the following is a specification.

My invention relates to liftingjachs; and it consists, iirst, in a novel construction and combination of parts for securely locking the vertically-adj ustable stock in place; second, in means for varying the throw of the lockingplate to compensate for variations of size and secure a proper operation of the locking-lever 5 third, in means for securing a wider range of action ofthe lifting-lever; fourth, of devices for locking said lever, when not in use, in such position as to render the whole device compact and allow it to be easily handled; and, iifth, in such construction as to effect the secure locking of the stock when adjusted and prevent all possibility of the play or shifting of the latter within its standard, all of which will be more fully described hereinafter, and then speeifically pointed out in the claims.

In the drawings, Figure lis a side elevation, showing` the jack in use. Fig. 2 is a vertical section taken in a plane passing through the center, or thereabout, of the jack. Fig. 3 is a 'side elevation, showin gthepivotedlever turned through one complete revolution and resting in a horizontal position. Fig. 4 is a detail view of the upper end ot' the standard, part thereof being broken away. Fig. 5 is a front elevation, showing the position of the parts when the jack is not in use. Fig. Gis a view of a detached part. Fig. 7 is a cross-section of the standard, taken at a point just a little below the upper end of said standard. Fig. S is a view of a detached part. Fig. 9 is a view of the bolt or pin upon which the lever turns to lock the adj ustable stock in position. Fig. l0 is an end elevation of the device shown in Fig. 9.

A in said drawings indicates the standard of the jack, which is set in a suitable base-piece. The standard A is hollow and of sufficient size to receive the stock B, which slides freely there-l from each other and cut to a suitable depth in said stock. These perforations afford means whereby the stock may be supported or locked at any height by means of a teat, a', upon a movable plate, G, which is actuated by a camlever, D. The latter is pivoted upon a pin, E, which has it bearings in ears b b, formed on the standard A. rIhe lever D, which is shown detached in Fig. 8, has an eccentric, d, formed thereon, which bears against the plate C, as shown in Fig. 7. As the lever D is turned in one direction-viz., outward and away from the standard A-the eccentric d bears against the the latch e and retracts the plate, withdrawing the pin a from the perforation in the stock with which it is engaged and leaving the stock free to move in the standard. Moving the lever in the opposite direction drives the plate forward by the eccentric bearing against the plate G. The latch c and plate C are connected by means of the plate F, which has a slot, j', formed therein to permit the pivot-pin E to pass through and at the same time allow the necessary movement of the plate. It is necessary in lookin g the stock in the position to which it is adjusted that the lever D should be turned down, as shown in Fig. 2, till the cam dis at its full throw. Otherwise the pressure might throw the cam oif and allow the stock to drop.

As it sometimes happens that the perforations a may be of slightly-different size, or that the tting of the parts may not be alike in all cases, it is necessary to provide some means for eft'eeting'the required compensation. For this purpose, therefore, I form a cam portion, c, upon the pivot-pin E, said cam portion being adapted to lie within the perforation b in the lever D. Upon the end of the pin E is formed an arm, G, which isbeveled off uponits inner surface to a knife-edge, g. This arm Gr turns upon the outer surface ot' one of the ears b, and the knife-edge g engages with any one of a series of notches, i', arranged in the are of a circle uponsaid ear b. The shaft can be thus turned and secured in any position so as Vto place the cani portion cin any position relative to the eccentric upon theleverD.' Thus, by placing the arm G in the upper notchz' the cam portion c of the pin E will lie in the position shown in Fig. l0. l/Vhen so placed the eccentric d upon the lever will actuate the plate C, but will move it just far enough to cause the teat a to enter the perforations in the stock, as shown in Figs. 2 and 7. To compensate for variations in size of the perforations or for the natural wear of the parts, the arm Gis turned down, thereby shifting the position of the cam portion c so as to cause the eccentric d to have a greater throw and move the slide-plate C farther in, thereby effecting complete engagement between the teat or stop and the movable stock. By turning this arm through an arc of forty-five degrees, or thereabout, the cam portion cmay be shifted to the sideof the pinEfarthestfrom thestandard, thereby giving the plate C an additional throw equal to the throw of the cam c. Adjustment-s between these two extremes may be made by causing the arm to engage with the notches intermediate between the extremities of the notched arcziand c, the arm beingplaced in such position as to enable the lever D to be turned down till its end is against the post, or nearly so.

The central bore or opening of the standard A being cylindrical, and being necessarily somewhat larger than the stock B, there is some play or movement of the latter within the standard, which should be prevented when the latter is locked in position. It is evident that when said stock is lifted and the plate C forced against it it will, if the top of the openin g is Varied, be liable to play or yield toward one side or the other, as it will be tangent to a single point only on that side of the standard opposite the plate C. To avoid this objection I form the standard A with two planesurfaced converging faces, ff, at the top of the opening, and at a suitable distance below I form two correspondingly arranged segments, f2f2, projecting from the surface of the opening to the same distance as the partsf'f. When the stock is raised and the lever D operated the body of said stock will be forced against and between these converging surfaces, thereby giving the stock, in connection with the locking devices, three separate bearing-points nearly equidistant from each other and effectually preventing the slightest play or shifting of the latter. VThe lever-bearing points f 2 f2 are placed nearly opposite the teat a in order to allow the highest possible adjustment of the stock. They serve to maintain a true vertical position of the latter.

The lifting-lever I is pivoted upon a pin, K, formed upon the head L of the stock B. Upon this head is also formed an extension or arm, M, and upon the extremity thereof is formed an .upper lip, m, the lower edge of the arm being beveled off outwardly to form a lower lip, m. Upon the lifting-lever I is placed a catch, N, adapted to engage With said lips and hold the lever with its load. By beveling the outer and upper edge ofthe arm M and constructing the catch N so that both its upper and lower edges will engage, the lever I may be adjusted in either of the three positions shown in Fig. l. The edge of the lever I is faced with metal O, having steps of the proper shape, and corrugated, as shown at a, to prevent slipplng.

When the jack is not in use it is desirable that the lever I be locked in such a position that it will occupy the least possible space and be prevented from swinging loosely upon its bearing. For this purpose I form upon the back of the standard A two lips, Z Z', one of which, l ,has an inwardly-beveled face. These lips are adapted to engage with a correspondingly-formed projection or catch, o, formed upon the edge of the metal facing O. In order to effect said engagement, the lever I is turned into a vertical position, as shown in Fig. 3, and is raised, together with the stock B, until the catch o is above the said lips. It is then dropped, the catch passing between the lips Z l', and the lever D is turned down, thus .locking the parts in place. When required for use the cam-lever D is thrown up and the stock B is lifted far enough to release the catch o from the lips Z l', when the jack is ready for adjustment and use. Instead of lookin g the lever in a vertical position, as described, it may, when not in use, be simply turned over through a half-circle into position shown in full lines in Fig. 3, when the catch o will engage with either one of the two lips m m.

The stock B and head L may bc castor otherwise formed in separate parts, and may be united in any suitable manner-as by casting the latter upon the former or by threading its extremity and securing it into a perforation in the heador the two may be cast in a single piece.

The base-piece is of wood, and the standard may be set in an opening formed therein,a collar or iiangap, formed thereon, resting upon the upper surface of the base. This base may, however, be made of iron in a single casting and of any suitable form or size.

By my invention I provide a jack which, by its wide range of adjustment, the strength and solidity of its parts, and the simplicity of the combined devices, may be used with great advantage for a variety of purposes. The adjustable stock, which may be positioned readily instantly, together with the range of action of the lifting-lever and the strong and simple means by which both functions are effected, together with the perfect steadiness of the operative parts, render my invention valuable for many purposes to which the ordinary wagonjack is not applicable. Moreover, as a matter of convenience in its storage and transportation the-ability to lock the lever in line with the standard is an advantage not to be overlooked.`

l. The combination, with a vertically-adjustable stock, of a locking device, a liftinglever pivoted to said stock, and an arm extending from the latter and having one, or more than one, lip formed upon its edge or edges and adapted to engage with a catch upon the lever, substantially as described.

IOD

IIO

2. The combination, with a vertically-adjustable stock, of a locking device consisting of a slide-plate carrying a teat'or equivalent device and a cam lever for operating said plate, a lifting-lever pivoted to said stock, and an arm extending from the latter and having one, or more than one, lip formed on its edge or edges to engage with a catch on the lever, substantially as described.

3. In a lifting-jack, the combination, with the standard and a stock moving vertically therein, of an eccentric locking device mounted upon an adjustable cam-bearing, whereby the throw of said locking device may be varied, substantially as set forth.

4. The combination, with the eccentric locking-lever, of the pivoted pin having a camshaped portion and provided with an arm adapted to engage with a series of detents upon the standard, substantially as described.

5. The combination, with the standard, the stock moving vertically therein, and the locking-lever having an eccentric, ot' the plate actuated by said lever and the pivot-pin upon which the latter turns, said pin having a cam portion and a locking-arm, substantial] y as set forth.

G. Thecombination,with thestock, of a head to which the lifting-lever is pivoted and an arm or extension formed on said head and provided with lips upon its upper and lower horizontal edges to engage with a catch upon the lever, substantially as set forth.

7. The combination, with the standard of the jack having lips formed upon its rear side, of the pivoted lever provided with a catch or projection at its end adapted to engage with said lips and hold the lever in a vertical position when not in use.

8. A standard forlifting-jacks, having on its interior cylindrical opening two plane-surfaced converging faces placed opposite the locking device, in combination with a stock moving vertically in said opening, substantially as described.

9. The combination, with the standard having the plane-surfaced converging faces f f', of the stock having perforations a, the lockin g-plate provided with a tcat, a', and the camlever for actuating said plate, substantially as described.

l0. The combination, with the stock, of the head L, having an arm, M, provided with lips m mf, and lifting -lever I, having catch N, adapted to engage with said arm, substantially as described.

1l. The combination of the standard A, having lips Z Z', with the lifting -lever I, having catch o, substantially as described.

l2. The combination of the standard A, h'aving lips l l', the stock B, the locking-plate G, and the lifting-lever I, provided with projection or catch o, substantially as described.

13. The combination, with the standard having ears b b, of the pivot-pin E, having a cam portion, c, the lever D, having an eccentric, d, the plate C, and the arm G, formed upon said pivot-pin and adapted to en gage with notches or detents formed upon one of the ears on the standard, substantially as described.

lei. The combination of the standard, the stock moving therein, the locking-lever with its eccentric, the pivot-pin having a cam thereon, the extension-arm on the head of the stock having lips upon its edges, and the lifting-lever having` a catch engaging with said lips, 

